[ZombieBerry]

Placing two spaces after a period is wrong.

That being said, you can hit the space bar once, then wait a second or two and hit it again.

You can also set it up so that your period and double space come up as a substitution for period/space.

Settings>Language and Input>Prediction and Correction>Word Substitution>Add Shortcut

Original Word - .<Space>

Sub with .<space><space>

Save, and Bob's your Uncle!